You can use hints to reveal safe tiles, and flag warnings to help you keep track of flags.
Click on the button Receive a hint for your next move on the top right to reveal a hidden tile that is safe. A penalty of ten seconds will be added to your total time. The penalty will be increased by ten seconds progressively on subsequent hints till the ninth hint.
To enable warnings, edit the preferences by selecting Mines ▸ Preferences and checking the checkbox next to Warn if too many flags are placed next to a number. This will warn you when you try to place too many flags next to an open tile.
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